Grand Battle Shirokuro Attacker

Looking at the rankings, it's full of anniversary characters like: Explosive Tomato Swimsuit Iroha Mystic Tomato Combat Ready Alice Vibration Insect Swimsuit Mika Let's aim to clear by borrowing from friends or our circles. Grand Battles are rewarding just for participating, so definitely join in. By the way, if you have both a Supporter and an Attacker, it's generally safer to prioritize raising the Supporter, since you can just borrow an Attacker.